Trying to verify LineageOS Recovery results in an error

[Deleted user]

user@fdvlm:~/Downloads/update_verifier$ python3 update_verifier.py lineageos_pubkey /media/sf_Downloads/lineage-18.1-20210401-recovery-ether.img
Traceback (most recent call last):
File "update_verifier.py", line 130, in
main()
File "update_verifier.py", line 118, in main
signed_file.verify(args.public_key)
File "update_verifier.py", line 94, in verify
self.check_valid()
File "update_verifier.py", line 77, in check_valid
assert self.footer[2] == 255 and self.footer[3] == 255, (
AssertionError: Footer has wrong magic

[gmrt]

I think you are using https://github.com/LineageOS/update_verifier or some other fork, there's no python code in this repo.